Electrical heating apparatus



H. GEISENHUNER- ELECTRICAL HEATING APPARATUS. 4 APPLICATION FILED JUN-E 2l 1920.

1,406,550. Patented Feb.'14, 1922.

2' SHEETS-SHEET I.

uummm Inventora 3'3 Henr eeisenhner; Fi .4 i 10 W 1% IF '7 45 '5' @flLLorneg.

H. GEISENHfiNER.

ELECTRICAL HEATING APPARATUS.

APPLlCATlON HL ED JUNE 21,1920;

Patented Feb. 14, 1922 2 SHEETSSHET 2.

F g \2 I ventor: H r- Geise n 161 1 His flqttof'n fl- UNITED STATES PATENT OFFICE.

HENRY GEISENHONER, OF SGHENECTADY,

TRIC COMPANY, A CORPORATION NEW YORK, ASSIGNOR TO GENERAL ELEC- OF NEW YORK.

ELECTRICAL HEATING APPARATUS.

Application filed June 21,

ing apparatus and more particularly to that type wherein material or articles are heated by the passage of an electric current there through.

One object of the present invention is to provide an apparatus of this character in which there are no movable parts designed to carry current.

Another object is to provide anelectrical heating apparatus having a pair of stationary electrodes with means for forcing the materialor articles to be heated against said electrodes. V

My invention will bebetter understood from the following description taken in connection with the accompanying drawing, and its scope willibe pointed out in the appended claims.- 7

Referring to the accompanying drawing, Fig. 1 is a side elevation of a heating apparatus embodying my invention; Fig. 2 isv a top plan view of the same. certain of the parts being broken away; Figs. 3, 3 and 4 are detail views, showing modifications of the means for pressing an article against. the electrodes; F 5 isaside elevation of an apparatus similar to that shown in Fig. 1 but modified to provide for the support of the articles in a plane inclined to the horizontal; Fig. 6 is a front elevation of the apparatus shown in Fig. 5; F ig. 7 is a detail view of a. modified form of article holder; Fig. 8 is a diagrannnatic view showing the circuit connections forheating a considerable number of articles in series; Fig. 9 is a front elevation of yet another modified form of my invention; Fig. 10 is a side elevation of the form of the apparatus shown in Fig. 9; Fig. 11 is a diagrammatic view showing the circuit arrangement for the apparatus shown in Figs. 9 and 10, and Fig. 12 is a diagrammatic view showing a. modified form of circuitarrangement.

Referring to Figs. 1 and 2 of the drawing, 10 represents a frame upon which is moi ed a transformer formed of a primary wind- Specification of Letters Patent.

, in the side bars.

Patented Feb. 14, 1922. 1920. Serial No. 390,507.

ing 11 and. a U-shaped secondary winding 12 Rod 13 connecting the top side bars of the frame 10 serves as a pivot for the arms 1 1 and pedals 15 pivoted at 16 and connected to the arms 1a through links 17 serve to move the arms about their pivotal support. Each of. the arms carries at its outer end a presser head 18, which is ada ted to engage an article to be heated. En order that the points of contact of the head with the article may be varied, each head is adjustably secured to its arm by means of a screw 19. The heads 18 are preferably insulated from each other in any suitable way. Extending between the top side-bars of the frame 10 are two cross pieces 20 and 21. The cross piece 20 is secured rigidly to, the frame and carries an the form of a bar provided with a raised portion23. This electrode is insulated from the cross bar 20 and is electrically connected to one terminal 2 1 of the secondary winding 12. The cross piece 21 is adjustably secured to the sidebars of the frame by means of wing bolts 25 which pass through slots 26 Electrode 27 formed with a raised port-ion 28 is carried upon the cross piece 21 and insulated therefrom and is connected by a flexible lead 29 to the opposite terminal 30 of the secondary winding. To prevent the weight of the presserheads 18 from carrying them to a position to close the circuit between electrodes 22 and 27, a stop 81 is secured to the frame 10 to limit the upward movement of the pedals 15.

In practice the articles to be heated, such as rivets, bolts, and the like, are placed across the electrodes 22 and 27 in a manner shown in the drawing, the corresponding pedals being depressed to lift the presser heads, which, when released, force the articles into firm contact with the electrodes; Each article completes a circuit through the secondary of the transformer and carries its portion of the total secondary current with the result that it is heated to the desired temperature. Figs. 1 and 2 show means by which four articles may be heated in parallel in the circuit. The electrode 27 may be adjusted to accommodate articles of different length.

The presser head, of course, may be dis pensed with, if desired, and the ends of the lever arms arranged to force the articles into contact with the electrodes. Fig. 3 shows electrode 22 in.

the end 32 of the lever arm bent to engage "the top of the article to be heated. Where the ;.presserheadscareomitted; the bolt on rivet may rest in groovesin' the tops of the electrodes to prevent the same from slipping from under the ends of the, lever arms as shown in Fig. 3, or the endlof the presser arm= maybe 'broadened'as in Fig. 3

In some instances, particularly when the articles are to be heated to a very lngh temperature, it has been found thatth'e pressure of the head 18 at a point between the electrodes-tends to bend the articles. To

' avoidthis, Fig. 4 shows the presser head jtorrned as a yoke-83yp1voted at 34: to the lever arm and provided with. two contact surfaces designed to engage the rivet at points directly above the electrodes adjustable cross bar and insulated therefrom V is ani electrode 37Vwhich is provided with groove s38 and 39 :tor' the reception of the shanks oftherivets; bolts, or the like. Se-

cured to the fixed-cross piece and insulated therefrom are electrodes 40 and 41 which are the form or" my inventionshown in, Figs. f5 and 6, two of the side bars oifthe f frame are'ext'ended upwardly at an'i-nc'line torthe' vertical, as shown at "3'5 and 36.. The's'eextensions. carry thefiiied cross bar and'the adjustable cross bar asinthe form sho'wn'in Figs. 1 and :2. Secured to the V 7 likewise provided with grooves arranged in alignment with the grooves of theelectrode V r 3 37. Electr'ode" l() is secured to one terminal andelectrode 41" to the opposite term'inalof 1 the; da y winding of the transiiormer.

The means for pressing the articles into contact with the electrodes consists of bell crank levers 42 formed as'shown and'pivotedat 4L3 tof the' frame of the apparatus. Pedals H "pivotei'd-to'across'rod' 45mm to operate said levers fthrough the connecting rods 4C6,

' Thecontact forces 0i the ipi esser arms are insulated from eacl1;.other in any, suitable manner, an insulating chit-4L2 being shown "for this purpose. From the construction 7 shown, it isapparent'that the articles. are

connected in series in the circuit.

article-i "alone is being heated-it is therefore necessary that some means beprovided' 1 for completing the circuit across the gap ca used 'by 'th'e, absenc'eiof the other article.

and; SQe-ngage the slide o flthe raised portion hen one of the electrode 37 and are therefore-pre vented from slipping through the grooves. In. caseit is desired to heat rods wlnelrarc 7 not providedwitli heads, the electrodes and 41 are preferably formed with shoulders to" engage the ends of the rods as is shown in Fig. 7. Theprovi sion' of such V shoulders on the electrodes does not prevent the useof the apparatus to heat articles without heads since the parts may be an ranged to let the heads project over the 7 upper edge of the upper electrode as-in Fig. 5.;

Am ng the advantages of the apparatus shown in-Figs. 5 and 6 is the provision ofa combined electrode and holder which is readily accessible fort-he insertion and removal of the articles to be heated and-which is con} structed and arranged to support thearticles uniformly in the same' position.

Fig. 8 shows a modificatlon which gbe applied to the form of heater shown either} in Figs. 1 and 2 or 5'an'd Gand' which-will enable aeonsiderablenumber of rivets to be" heated in series. In that figure, 50 and151 are two electrodes'connected' to opposite 1 terminals of thetransformer secondaryp 52,

53 and 54 are electrodes adapted eachto 'engage. a pair of rivets or thelike and 55 land 56*are electrodes adapted toconhect the: ends of r-rivets' of adjacent pairs.

Figs;v 9 and 10, of my'invention disclosea j I 'form of apparatus particularly useful for heating soldering irons. In thesefigures 'a. r V

10C sists of a. primary winding ,58 and; f secondary'winding 59. Theone terminal 605 of the secondary winding 59 is" connected to frame 57: carriesa transformerwhich cona centralelectrode: 61 which consists of I blocl'z of carbon orsimilar material 62', held within a channel-shaped member'63. Menu her 63 is'secured. to the -frame 57 by'mieans of bolts 64: which pass through the opposite terminal 65 of the secondary winding of the; transformer but are insulated therefrom at 66;; These bolts likewise pass through insulating spacing blocks 66" and,secure in:

contact with the terminal, 65iof thetrans-i V former the cross'connector -67 which conneots the two end-,electrodesfi These electrodes some distance fromuone'another andf per portions of adjacent faces are; cut away, asind cated a t-71' for the reception of the are also formed: of carbon blocks indicated at 69"secured within channel-shapedmembers70. Ga'rbon'blooks" ZiandgGQarespQC-ed soldering'i'ron; The bolt '72 whioh'isecuresf cross I piece-.74 "provided with openings :75 for fr c pt bn'o h s 76 9 9 any" we ghts whichliarejadapted to rest upon e terminal '60, to the central electrode T61;- 7 a so pass s; thro gh and l r ii -i e. 151 fi ie e triid P YB- T i upr h is" suitably insulated from the central elee-i" '7 trode' andiis formed at itsiupperlendwith 1 the soldering irons and press them into contact with the electrodes. Brackets 78 shown in Fig. 10 assist in holding the soldering irons in place while being heated. The soldering irons in the apparatus shown in Figs. 9 and 10 are connected in parallel in the circuit as is shown in Fig. 11. The circuit connections may, however, be altered by omitting'the cross connector 67 and connecting the terminals 60 and 65 to the outside electrodes, as is shown in Fig. 12 of the drawing, in which case the tools will be connected in series.

\Vhat I claim as new and desire to secure by Letters Patent of the United States, is

1. In an apparatus for heating an article by passing an electric current therethrough, a circuit, two electrodes connected to opposite terminals of the circuit and formed to constitute a bed for the support of the article and means not included in the circuit for engaging said article and forcing it into contact with the electrodes.

2. In an apparatus for heating an article by passing an electric current therethrough, a circuit, two electrodes connected to opposite terminals of the circuit and formed to constitute a bed for the support of the article and means not included in the circuit for engaging said article and pressing it into contact with the electrodes, said means com prising a lever arm and a presser head ad justably mounted on the lever arm to vary the point of application of pressure to the article.

3. In an apparatus for heating an article by passing an electric current therethrough, a circuit, two electrodes connected to opposite terminals of the circuit and formed to constitute a bed for the support of the article and means not included in the circuit for engaging said article and pressing it into contact with the electrodes, said means comprising an arm provided with a presser head.

4. In an electrical apparatus, the combination of upper and lower electrodes, both supported in an inclined plane, the upper electrode being provided with a supporting groove, the lower electrode being provided with a supporting groove in alignment with the first mentioned groove, and one of said electrodes being provided with a surface arranged to engage the article to be heated, and prevent slipping thereof along the inclined surfaces of the electrodes,

5. I11 an apparatus for electrically heating articles, a source of current, a row of electrodes each of which is adapted to make contact with a pair of articles, a second row of electrodes, the end electrodes of said second row being connected to said source and each adapted to make contact with one article, the intermediate electrodes of said second row being adapted to make contact with one article of two adjacent pairs where by said circuit is completed through all of said electrodes and articles in series, and means not included in the circuit for forcing said articles into contact with said electrodes. j

6. A combination with two spaced electrodes formed with their adjacent faces cut away for the reception of an article to be placed between the electrodes, of means for forcing the article into contact with the electrodes.

7. A combination with a frame, of a trans former mounted on said frame, a series of spaced electrodes the adjacent faces of which are cut away for the reception of articles to be placed between the electrodes, an upright secured to one of the electrodes but insulated therefrom, a cross bar formed at the upper end of said upright and provided with openings, weights adapted to rest upon the articles when the same are in position between the electrodes, rods connected to said weights and passing through said openings and connections from said transformer to said elec trodes.

In witness whereof, I have hereunto set my hand this 18th day of June, 1920.

HENRY GEISENHONER. 

